[INI] Fix memory leaks + other fixes (#38)

* [INI] Fix memory leaks + other fixes

* Add ini_free
* check and return if NULL pointer in free()
* Add button check with timeout
* Fix a bug in menu rendering that tries to parse a string without existing
* Change initial cnt value to max (fixes menus with first entry not a selectable entry)
* Some & ? clarifications

* [INI] Add get selected boot cfg

- This allows to free ini as we launch the firmware and have the lowest mem leak

* [INI] Rename ini section clone/free functions

ipl/ini.h

@@ -35,5 +35,8 @@ typedef struct _ini_sec_t
 } ini_sec_t;
 
 int ini_parse(link_t *dst, char *ini_path);
+void ini_free(link_t *dst);
+ini_sec_t *ini_clone_section(ini_sec_t *cfg);
+void ini_free_section(ini_sec_t *cfg);
 
 #endif